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Joe Cho questions police response after claims 911 operators didn't understand his call for help after a robbery because of his accent. City leaders are concerned too. (Published Wednesday, May 8, 2013)

Caraway, who heard a recording of Cho's call, said he found the word robbery and the caller's urgency to be very clear.

"You have an opportunity to catch the robber if you happen to get there within minutes and the suspect is still on property or just recently drove away," he said. "But after an hour, all of that goes away, so I do have concerns there."

Dallas police posted the audio of the 911 call on YouTube.

"They should have been here faster than that, because I'm not the only one living in this West Dallas," Cho said.

In March, a police official briefing to the City Council Public Safety Committee showed a big improvement in 911 response after a series of alarming delays last year.

A house down the street from a fire station burned down on July 4 as callers trying to report the fire received busy signals.

Police said Deanna Cook was killed in her home Aug. 17 by an abusive ex-husband after she called 911. Cook can be heard pleading for her life in the call, but the call-taker did not pass important details on to dispatchers, police said.

Councilwoman Sandy Greyson, who attended the March briefing, said the new incident is troubling.

"It shows we have more work to do," she said.

Mayor Mike Rawlings issued a statement:

"The improvements made in 911 in the last several months have resulted in better performance measures within the call center," Mayor Mike Rawlings said in a statement. "The department has shown a willingness to make significant changes and training to enhance performance. But, obviously, we have got a lot of work to do."

The other three robbers have not been arrested. Police said their investigation into the robbery is ongoing.